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SEGMENT REPORTING (Tables)
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Reconciliation of Third Party Revenues to Direct Revenues
The following tables reconcile third-party revenues to direct revenues for the years ended December 31, 2021, 2020 and 2019 (in thousands):
 For the year ended December 31, 2021
 Environmental
Services		Safety-Kleen Sustainability SolutionsCorporate
Items		Totals
Third-party revenues$3,025,907 $779,360 $299 $3,805,566 
Intersegment revenues, net6,547 (6,547)— — 
Direct revenues$3,032,454 $772,813 $299 $3,805,566 
 For the year ended December 31, 2020
 Environmental
Services
Safety-Kleen Sustainability Solutions
Corporate
Items		Totals
Third-party revenues$2,637,641 $506,166 $290 $3,144,097 
Intersegment revenues, net(1,740)1,740 — — 
Direct revenues$2,635,901 $507,906 $290 $3,144,097 
 For the year ended December 31, 2019
 Environmental
Services
Safety-Kleen Sustainability Solutions
Corporate
Items		Totals
Third-party revenues$2,802,682 $608,372 $1,136 $3,412,190 
Intersegment revenues, net(6,688)6,688 — — 
Direct revenues$2,795,994 $615,060 $1,136 $3,412,190 
Reconciliation to Consolidated Statements of Income to Adjusted EBITDA
The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):
 For the years ended December 31,
 202120202019
Adjusted EBITDA:   
Environmental Services$659,718 $665,918 $600,413 
Safety-Kleen Sustainability Solutions227,354 83,214 128,249 
Corporate Items(210,466)(175,328)(170,529)
Total676,606 573,804 558,133 
Reconciliation to Consolidated Statements of Operations:   
Accretion of environmental liabilities11,745 11,051 10,136 
Stock-based compensation18,839 18,502 17,816 
Depreciation and amortization298,135 292,915 300,725 
Income from operations347,887 251,336 229,456 
Other expense (income), net515 290 (2,897)
Loss on early extinguishment of debt— — 6,131 
Loss (gain) on sale of businesses— 3,376 (687)
Interest expense, net of interest income77,657 73,120 78,670 
Income from operations before provision for income taxes$269,715 $174,550 $148,239 
Schedule of Segment Reporting Information, by Segment
The following table presents assets by reported segment and in the aggregate (in thousands):
December 31, 2021December 31, 2020
Property, plant and equipment, net  
Environmental Services$1,374,913 $1,068,910 
Safety-Kleen Sustainability Solutions373,721 366,160 
Corporate Items114,541 90,228 
Total property, plant and equipment, net$1,863,175 $1,525,298 
Goodwill and Permits and other intangibles, net  
Environmental Services  
Goodwill$1,085,534 $401,918 
Permits and other intangibles, net498,739 228,237 
Total Environmental Services1,584,273 630,155 
Safety-Kleen Sustainability Solutions
Goodwill$141,508 $125,105 
Permits and other intangibles, net146,173 158,383 
Total Safety-Kleen Sustainability Solutions287,681 283,488 
Total$1,871,954 $913,643 
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
As of December 31, 2021 and 2020, the Company had property, plant and equipment, net of depreciation and amortization and permits and other intangible assets, net of amortization in the following geographic locations (in thousands):
December 31, 2021December 31, 2020
Total% of TotalTotal% of Total
Property, plant and equipment, net  
United States$1,610,402 86.4 %$1,246,758 81.7 %
Canada and other foreign252,773 13.6 278,540 18.3 
Total property, plant and equipment, net$1,863,175 100.0 %$1,525,298 100.0 %
Permits and other intangibles, net  
United States$604,076 93.7 %$342,787 88.7 %
Canada and other foreign40,836 6.3 43,833 11.3 
Total permits and other intangibles, net$644,912 100.0 %$386,620 100.0 %
Long-lived Assets by Geographic Areas
The following table presents the total assets by geographical area (in thousands):
December 31, 2021December 31, 2020
United States$5,077,585 $3,447,811 
Canada and other foreign576,114 683,709 
Total$5,653,699 $4,131,520